CN1060209C - Detergent for cleaning evaporating pot of sugar mill and method for cleaning it - Google Patents
Detergent for cleaning evaporating pot of sugar mill and method for cleaning it Download PDFInfo
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- CN1060209C CN1060209C CN97101779A CN97101779A CN1060209C CN 1060209 C CN1060209 C CN 1060209C CN 97101779 A CN97101779 A CN 97101779A CN 97101779 A CN97101779 A CN 97101779A CN 1060209 C CN1060209 C CN 1060209C
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- pickling
- inhibiter
- cleaning
- evaporating pot
- scavenging solution
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- 238000001704 evaporation Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000004140 cleaning Methods 0.000 title abstract description 19
- 239000003599 detergent Substances 0.000 title 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000003513 alkali Substances 0.000 claims abstract description 17
- -1 imidazoline quaternary ammonium salt Chemical class 0.000 claims abstract description 17
- 238000005554 pickling Methods 0.000 claims abstract description 13
- 238000009835 boiling Methods 0.000 claims abstract description 10
- 239000002904 solvent Substances 0.000 claims abstract description 6
- 230000008020 evaporation Effects 0.000 claims abstract 3
- 239000004094 surface-active agent Substances 0.000 claims abstract 2
- 230000002000 scavenging effect Effects 0.000 claims description 25
- 239000002253 acid Substances 0.000 claims description 21
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 9
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 9
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 9
- 238000010926 purge Methods 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical group CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- 229920003171 Poly (ethylene oxide) Polymers 0.000 claims description 4
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 4
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 238000002161 passivation Methods 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 claims description 2
- 239000013543 active substance Substances 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 238000005406 washing Methods 0.000 claims 3
- 238000005260 corrosion Methods 0.000 abstract description 21
- 230000007797 corrosion Effects 0.000 abstract description 21
- 230000005764 inhibitory process Effects 0.000 abstract description 12
- 239000007788 liquid Substances 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 4
- 239000003112 inhibitor Substances 0.000 abstract description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Inorganic materials [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 21
- 239000000243 solution Substances 0.000 description 20
- 235000011167 hydrochloric acid Nutrition 0.000 description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 235000011121 sodium hydroxide Nutrition 0.000 description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 238000011010 flushing procedure Methods 0.000 description 5
- 239000002131 composite material Substances 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 125000004433 nitrogen atom Chemical group N* 0.000 description 4
- 238000007654 immersion Methods 0.000 description 3
- 230000000116 mitigating effect Effects 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000452 restraining effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 101100298222 Caenorhabditis elegans pot-1 gene Proteins 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000370738 Chlorion Species 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000010349 cathodic reaction Methods 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002170 ethers Chemical class 0.000 description 1
- 150000002191 fatty alcohols Chemical class 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000000413 hydrolysate Substances 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 125000001165 hydrophobic group Chemical group 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000006210 lotion Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002120 nanofilm Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 150000002897 organic nitrogen compounds Chemical class 0.000 description 1
- 238000005373 pervaporation Methods 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 150000004291 polyenes Chemical class 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Detergent Compositions (AREA)
Abstract
本发明涉及一种糖厂蒸发罐的清洗液及清洗方法，属制糖工业蒸发罐积垢处理技术领域。本发明的清洗液由咪唑啉季铵盐、溶剂、表面活性剂复配而成的缓蚀剂和盐酸制成。酸洗或碱煮后再酸洗的清洗方法均采用本发明的清洗液在室温至50℃温度下进行。本发明的清洗液具有腐蚀率低，缓蚀率高，稳定性好等优点，清洗方法简便易行，除垢效果好。
The invention relates to a cleaning solution and a cleaning method for an evaporation tank in a sugar factory, and belongs to the technical field of fouling treatment for evaporation tanks in the sugar industry. The cleaning solution of the present invention is made of corrosion inhibitor compounded by imidazoline quaternary ammonium salt, solvent and surfactant and hydrochloric acid. The cleaning method of pickling or pickling after alkali boiling is carried out at room temperature to 50°C by using the cleaning solution of the present invention. The cleaning liquid of the present invention has the advantages of low corrosion rate, high corrosion inhibition rate, good stability, etc., and the cleaning method is simple and easy to implement, and the descaling effect is good.
Description
The present invention relates to a kind of sugar refinery evaporating pot scavenging solution and purging method, belong to sugar industry evaporating pot cleaning technique field.
Yunnan Province's scientific information research is retrieved the new center of looking into, pass through international online, system's retrieval of data of optical disk and manual search tool, in range of search, do not find the compounded technology identical and the document of prescription, do not find document yet with formulation product of the present invention (clean-out system) pickling sugar refinery evaporating pot scale removal with clean-out system of the present invention.
The object of the present invention is to provide a kind of with low costly, cleaning performance is good, the purging method of sugar refinery evaporating pot clean-out system easy to use.
The present invention is achieved in that scavenging solution of the present invention comprises inhibiter and hydrochloric acid.Inhibiter is that ethanol, Virahol, ethylene glycol or propylene glycol, tensio-active agent are alkylphenol polyoxyethylene (EO mole number 8,9,10) and composite the forming of fatty alcohol-polyoxyethylene ether (EO mole number 7,9,10) by imidazoline quaternary ammonium salt, solvent, the inhibiter consumption is that 0.05 of hydrochloric acid soln weight～O.2%, the hydrochloric acid concentration expressed in percentage by weight is 1～7%.The weight percent of inhibiter is: imidazoline quaternary ammonium salt 45～55%, fatty alcohol-polyoxyethylene ether 2～6%, alkylphenol polyoxyethylene 20～35%, surplus be solvent.
The inhibiter of aforementioned proportion and hydrochloric acid method are routinely obtained scavenging solution after composite.With pickling evaporating pot after direct pickling of this scavenging solution or the soda boiling, scavenging solution is reusable, until scavenging solution by the saturated and pH value of dirt that comes off be 3～5 lose cleansing power till.
Cleaning step of the present invention is: at first according to the jar age of sugar refinery evaporating pot, the cleaning history in past and incrustation feature are selected acid cleaning process after direct pickling and the first soda boiling.Directly during pickling, earlier clear water is injected the complex acid groove, add inhibiter, evenly mixed, inject concentrated hydrochloric acid, remix evenly promptly gets scavenging solution, and wherein the inhibiter consumption is 0.05%～0.2% of a hydrochloric acid soln weight, and the hydrochloric acid concentration expressed in percentage by weight is 1～7%.Clean-out system is pumped into evaporating pot, in room temperature to 50 ℃ employing circulation one immersion way cleaning down, through 2～8 hours, incrustation comes off, and clean-out system is recovered to the complex acid groove, uses the flushing with clean water evaporating pot, with concentration expressed in percentage by weight is that 0.3～O.6% alkali lye pumps into evaporating pot, soak and implemented passivation in 0.5～2 hour, emit alkali lye, water flushing evaporating pot to alkali storage groove.
Adopt when boiling acid cleaning process behind the alkali earlier: be earlier that 1～3% alkali lye pumps into evaporating pot with concentration expressed in percentage by weight, keeping little boiled 6～8 hours, emit alkali lye subsequently, after water rinses out residual alkali, pump into the hydrochloric acid scavenging solution that contains inhibiter again, wherein the inhibiter consumption is 0.05%～0.2% of a hydrochloric acid soln weight, and the hydrochloric acid concentration expressed in percentage by weight is 1～7%.Adopt immersion-Recycle design to clean, after 2～8 hours, incrustation dissolves and comes off, and later evaporating pot treatment process is the same.
Scavenging solution inhibition mechanism of the present invention is as follows:
The reason of scavenging solution corrosion inhibition of the present invention is imidazoline quaternary ammonium salt, and structural formula is as follows:
This imidazoline quaternary ammonium salt has good corrosion inhibition, and this corrosion inhibition is that imidazoline quaternary ammonium salt is adsorbed on formation protectiveness molecular film on the metallic surface, forms to stop H
+The sealing coat of ion attack iron, its adsorption is strengthened by following factors:
(1) the tetrahydroglyoxaline five-membered ring is adsorbed on the metallic surface, has an effect between the valence electron of delocalization positive charge and metallic iron atom on the ring, and valence electron is filled unoccupied orbital and formed dative bond, thereby strengthens adsorption between five-membered ring and the metallic iron.
(2) in the molecule remaining N atomic adsorption on the metallic iron surface, this absorption may by the N atom not the 3d unoccupied orbital of share electron pair and iron atom form that dative bond caused.In hydrochloric acid soln, the relation between organic nitrogen compound and the adsorbent be studies show that: what the chemisorption of a plurality of N atoms will be good than the compound that only contains single N atom is many.
(3) the last alkyl hydrophobic group carbon chain lengths that links to each other of N more than 9 and 17 corrosion mitigating effects when following good.
(4) polyamines polyene hydrophilic chain length because nitrogen-atoms is many, helps absorption.Yet, when hydrophilic chain length is too long, inhibition usefulness is descended, this may be the hydrophobic chain to the proportion of whole molecule descend cause, corrosion mitigating effect is best during general m=2.
(5) hydrophobic group then can be strengthened corrosion mitigating effect in hydrochloric acid soln as containing two keys.
Inhibiter corrosion inhibition of the present invention says that from electrochemical behavior anticathode reaction and anodic reaction all have restraining effect, and the cathodic reaction restraining effect is remarkable.
Following hydrolysis reaction can take place down room temperature or 50 ℃ in inhibiter of the present invention in hydrochloric acid soln:
The hydrolysate acid amides is inhibiter equally, and Here it is scavenging solution of the present invention can be reused major cause repeatedly at the matting scene.
Accompanying drawing is this purging method schematic flow sheet.Sequence number is 1-evaporating pot, 2-liquid discharging tube, 3-complex acid groove, 4-blow-off pipe, 5-pump, the circulation of 6-complex acid, 7-liquid-inlet pipe, 8-manhole among the figure.
The present invention is described in further detail as follows in conjunction with the accompanying drawings:
Embodiment 1: direct pickling process.Get imidazoline quaternary ammonium salt (R
1: C
15Unsaturated alkyl, R
2Be phenmethyl, X is a chlorion, m=2) 45 parts, and 21 parts of ethylene glycol, 30 parts of polyoxyethylene nonylphenol ethers (EO mole number 7), 4 parts of 12 carbon polyoxyethylenated alcohol (EO mole number 10), composite inhibiter of the present invention.Add 5 cubic metres in water at the complex acid groove, add 14 kilograms of inhibiter of the present invention, making the inhibiter consumption is 0.19% of hydrochloric acid pickler weight percent, concentration of hydrochloric acid is 4.6%, open the valve of complex acid circulation tube 6 this moment, close the valve of liquid-inlet pipe 7, starting pump 5 makes complex acid groove 3 include the inhibiter aqueous solution constantly to circulate, slowly pour 1064 kilograms of industrial concentrated hydrochloric acids (concentration is 32%) in the complex acid groove, add water to 7 cubic metre again, continue to be circulated to and mix, open the valve of liquid-inlet pipe 7, close the valve of complex acid circulation tube 6, scavenging solution is pumped into evaporating pot 1 (530 square metres of heating-surface areas) through manhole 8, open liquid discharging tube 2 valves, after the half an hour of circulating, keep scavenging solution lid pervaporation jar 1 upper tubesheet, soaked 1 hour, and circulated half an hour, the immersion that so circulates hocketed 8 hours, treat that the incrustation overwhelming majority comes off, scavenging solution is recovered to complex acid groove 3 and stores stand-by.Use residual acid in the flushing with clean water jar this moment immediately, pumps into concentration immediately and be 0.5% dipping by lye half an hour, subsequently alkali lye is recovered to alkali storage groove, at last again with the clean evaporating pot of flushing with clean water.
Embodiment two:
Acid cleaning process after elder generation's soda boiling.
Imidazoline quaternary ammonium salt (R
1-C
17Unsaturated alkyl, R
2-normal-butyl, the X-bromide anion, m=0) 50 parts, 20 parts of propylene glycol, 23 parts of dodecylphenyl Soxylat A 25-7s (EO mole number 10), 5 parts of high fatty alcohol Soxylat A 25-7s (EO mole number 9) composite inhibiter of the present invention.Put into 80 kilograms of calcined soda for industry at evaporating pot (250 square metres of heating-surface areas), add clear water, liquid level was covered upper tubesheet (concentration 2.3%), and little boil 8 hours (when liquid level descends, replenishing proper amount of clear water) is recovered to the alkali groove with alkali lye and stores.The residual alkali of flushing with clean water.The complex acid groove injects 3.5 cubic metres of water and 7 kilograms of inhibiter of the present invention, circulation contains the inhibiter aqueous solution, do not stopping slowly to pour 448 kilograms of (concentration of hydrochloric acid 3.6% of technical hydrochloric acid (concentration 32%) under the circulation, density of corrosion inhibitor 0.18%), circulated 30 minutes, make concentration of lotion even, scavenging solution pumped into began in the evaporating pot to circulate 30 minutes, keep liquid level to cover upper tubesheet, soaked 1 hour, so circulation-immersion is 3 hours, incrustation comes off, scavenging solution is recovered to the complex acid groove, with the residual acid of cleaning evaporating pot, afterwards again alkali lye (concentration 0.6%) pump in evaporating pot, liquid level during the high overpickling of liquid level, soak half an hour, the residual acid that thoroughly neutralizes, alkali lye is put back to and is joined the storage of alkali groove.Water cleans evaporating pot.
Soda boiling also phosphoric acid three receive, caustic soda etc.
Reusable 2～3 times of scavenging solution of the present invention, what scavenging solution was come off is dirty saturated, and discharges with clarification in o'clock then available liquor calcis of pH3～5.
Adopt the corrosion rate and the corrosion inhibition rate data of this scavenging solution as follows:
Illustrate: 60 ℃ of test specimen soaking temperatures, 4 hours time.
| Concentration of hydrochloric acid inhibiter ‰ of the | 7％ | 5％ | 3％HCL | The test specimen surface condition | |||
| Corrosion rate g/m 2h | Corrosion inhibition rate % | Corrosion rate g/m 2h | Corrosion inhibition rate % | Corrosion rate g/m 2h | Corrosion inhibition rate % | ||
| 0.5 | 0.57 | 99.3 | 0.36 | 99.3 | 0.29 | 99.5 | |
| 1.0 | 0.59 | 99.3 | 0.33 | 99.3 | 0.29 | 99.5 | Keep metal |
| 1.5 | 0.55 | 99.4 | 0.40 | 99.2 | 0.29 | 99.5 | Gloss |
| 2.0 | 0.42 | 99.5 | 0.39 | 99.2 | 0.26 | 99.5 | |
| Do not add | 87.03 | 52.47 | 47.34 | Surface irregularity black | |||
The present invention is except that the cleaning that can be used for sugar refinery evaporating pot, and the scale removal processing that also can be used for boiler, chemical industry equipment all can obtain satisfied effect.
The present invention uses proof through tens of families sugar refinery; It is low that this clean-out system has a corrosion rate, the corrosion inhibition rate height, and advantages such as good stability, purging method is simple and easy to do, features high scale-removing effect.
Claims (2)
1. sugar refinery evaporating pot scavenging solution, comprise inhibiter, hydrochloric acid, it is characterized in that inhibiter is formed by imidazoline quaternary ammonium salt, solvent and surfactant compound, wherein solvent is selected from ethanol, Virahol, ethylene glycol or propylene glycol, tensio-active agent is the mixture of the fatty alcohol-polyoxyethylene ether of the alkylphenol polyoxyethylene of EO mole number 8,9,10 and EO mole number 7,9,10, the inhibiter consumption is 0.05～0.2% of a hydrochloric acid soln weight, and the hydrochloric acid concentration expressed in percentage by weight is 1～7%; The weight percent of inhibiter is: imidazoline quaternary ammonium salt 45～55%, fatty alcohol-polyoxyethylene ether 2～6%, alkylphenol polyoxyethylene 20～35%, surplus are solvent.
2. sugar refinery evaporation purging method comprises direct pickling or first soda boiling pickling again, it is characterized in that:
2.1 directly pickling or soda boiling again acid washing method all adopt the scavenging solution of claim 1, scavenging solution is reusable, until scavenging solution by the dirt that comes off saturated and pH value be 3～5 lose cleansing power till;
2.2 directly after pickling or the soda boiling again in the acid washing method matting under room temperature to 50 ℃ temperature, carry out, scavenging period is 2～8 hours;
2.3 after acid washing method cleans evaporating pot again after direct pickling or the soda boiling, adopt the raffinate in the passivation procedure processing evaporating pot at last, the concentration expressed in percentage by weight of used alkali lye is 0.3～0.6% in the passivation procedure, soak time is 0.5～2 hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97101779A CN1060209C (en) | 1997-03-01 | 1997-03-01 | Detergent for cleaning evaporating pot of sugar mill and method for cleaning it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97101779A CN1060209C (en) | 1997-03-01 | 1997-03-01 | Detergent for cleaning evaporating pot of sugar mill and method for cleaning it |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1192466A CN1192466A (en) | 1998-09-09 |
| CN1060209C true CN1060209C (en) | 2001-01-03 |
Family
ID=5165985
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97101779A Expired - Fee Related CN1060209C (en) | 1997-03-01 | 1997-03-01 | Detergent for cleaning evaporating pot of sugar mill and method for cleaning it |
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| Country | Link |
|---|---|
| CN (1) | CN1060209C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101787536B (en) * | 2009-11-10 | 2012-05-23 | 南通飞拓界面工程科技有限公司 | Normal temperature hydrochloric acid pickling rust removing additive |
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| CN102021583B (en) * | 2011-01-07 | 2012-04-11 | 陕西省石油化工研究设计院 | Corrosion inhibitor for oil well and preparation method thereof |
| CN102392264B (en) * | 2011-11-23 | 2016-06-15 | 上海申和热磁电子有限公司 | A kind of inhibiter, scavenging solution and application thereof |
| CN102519300B (en) * | 2011-12-07 | 2013-05-15 | 刘沣 | Method for chemically and circularly cleaning scale inside and outside pipes of evaporating tank and heater in the sugar factory |
| CN103184455B (en) * | 2013-04-02 | 2016-05-25 | 莱芜钢铁集团有限公司 | One is utilized the agent of converter high-temperature flue gas pyrolysis coking chemical waste water flue gas special corrosion |
| CN103643237B (en) * | 2013-11-11 | 2016-09-21 | 青岛佰众化工技术有限公司 | hydrochloric acid composite corrosion inhibitor |
| CN105605966B (en) * | 2016-01-07 | 2018-04-10 | 广西农垦糖业集团西江制糖有限公司 | A kind of cleaning method of sugar evaporator |
| CN105670588B (en) * | 2016-02-23 | 2018-07-13 | 中国石油天然气股份有限公司 | A kind of descaling agent and its preparation method and application |
| CN108188120A (en) * | 2017-12-21 | 2018-06-22 | 广西吉然科技有限公司 | A kind of high-efficiency washing method of incrustation in evaporator |
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|---|---|---|---|---|
| SU256668A1 (en) * | 1968-07-08 | 1980-01-05 | Всесоюзный научно-исследовательский институт сахарной промышленности | Method of cleaning heating surface of evaporating apparatus from boiler scale |
| US4289639A (en) * | 1980-10-03 | 1981-09-15 | The Dow Chemical Company | Method and composition for removing sulfide-containing scale from metal surfaces |
| CN1069296A (en) * | 1991-08-12 | 1993-02-24 | 刘沣 | The cyclic cleaning method of calcium dirt and scavenging agent |
-
1997
- 1997-03-01 CN CN97101779A patent/CN1060209C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU256668A1 (en) * | 1968-07-08 | 1980-01-05 | Всесоюзный научно-исследовательский институт сахарной промышленности | Method of cleaning heating surface of evaporating apparatus from boiler scale |
| US4289639A (en) * | 1980-10-03 | 1981-09-15 | The Dow Chemical Company | Method and composition for removing sulfide-containing scale from metal surfaces |
| CN1069296A (en) * | 1991-08-12 | 1993-02-24 | 刘沣 | The cyclic cleaning method of calcium dirt and scavenging agent |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101787536B (en) * | 2009-11-10 | 2012-05-23 | 南通飞拓界面工程科技有限公司 | Normal temperature hydrochloric acid pickling rust removing additive |
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| Publication number | Publication date |
|---|---|
| CN1192466A (en) | 1998-09-09 |
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